TABLE 2.
Sex and SF sum category2 | Subjects | Age | Nonwhite | CDC BMI z score | Obese | SF sum | PBFSlaughter | PBFDXA | PBFSlaughter – PBFDXA |
n | y | % | % | mm | % | % | % | ||
Boys | |||||||||
<15 mm | 143 | 9.8 ± 73 | 70 | −0.39 ± 1.1 | 0 | 12 ± 2 | 9.9 ± 3 | 9.6 ± 4 | 0.5 ± 3 |
15–24 mm | 240 | 11.9 ± 6 | 71 | 0.28 ± 0.9 | 2 | 18 ± 5 | 15.9 ± 5 | 14.5 ± 7 | 1.5 ± 5 |
25–49 mm | 178 | 12.4 ± 6 | 79 | 1.22 ± 0.7 | 22 | 33 ± 12 | 28.5 ± 9 | 25.7 ± 10 | 2.6 ± 6 |
≥50 mm | 65 | 12.2 ± 4 | 80 | 2.10 ± 0.5 | 89 | 61 ± 19 | 49.4 ± 15 | 38.9 ± 8 | 12.0 ± 10 |
Girls | |||||||||
<20 mm | 149 | 9.1 ± 4 | 70 | −0.26 ± 1.2 | 0 | 16 ± 5 | 15.5 ± 5 | 15.4 ± 6 | −0.6 ± 5 |
20–34 mm | 213 | 12.0 ± 6 | 71 | 0.32 ± 1.0 | 1 | 26 ± 7 | 23.3 ± 4 | 24.5 ± 7 | −0.9 ± 5 |
35–59 mm | 149 | 13.0 ± 5 | 84 | 1.19 ± 0.8 | 24 | 43 ± 10 | 33.2 ± 5 | 35.0 ± 7 | 0.2 ± 6 |
≥60 mm | 59 | 13.5 ± 5 | 80 | 2.06 ± 0.6 | 80 | 72 ± 17 | 49.0 ± 9 | 43.5 ± 7 | 5.8 ± 9 |
PBFDXA, percentage body fat estimated by using dual-energy X-ray absorptiometry; PBFSlaughter, percentage body fat estimated by using the Slaughter skinfold-thickness equations; SF sum, sum of subscapular and triceps skinfold thicknesses.
Cutoffs for the SF sum categories approximate the 33rd, 67th, and 90th percentiles within each sex; cutoffs were rounded to the nearest 5 mm.
Median ± IQR (all such values).